Table 4

Standardised mortality ratio (SMR), mean and (95% CI)

0 – 90 days

91 – 365 days

N

Deaths

SMR

Deaths

SMR

Trial patients

724

1

1.61 (0.02 – 3.46)

3

0.62 (0.13 – 1.78)

Non-randomised patients

993

23

3.42 (2.17 – 5.13)

26

1.27 (0.90–1.86)

Ros et al. BMC Surgery 2006 6:17   doi:10.1186/1471-2482-6-17